/**
 *
 *  Base64 encode / decode
 *  http://www.webtoolkit.info/
 *
 **/

var Base64 = {

		  // private property
_keyStr : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",

			 // public method for encoding
			 encode : function (input) {
						var output = "";
						var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
						var i = 0;

						input = Base64._utf8_encode(input);

						while (i < input.length) {

								  chr1 = input.charCodeAt(i++);
								  chr2 = input.charCodeAt(i++);
								  chr3 = input.charCodeAt(i++);

								  enc1 = chr1 >> 2;
								  enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
								  enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
								  enc4 = chr3 & 63;

								  if (isNaN(chr2)) {
											 enc3 = enc4 = 64;
								  } else if (isNaN(chr3)) {
											 enc4 = 64;
								  }

								  output = output +
											 this._keyStr.charAt(enc1) + this._keyStr.charAt(enc2) +
											 this._keyStr.charAt(enc3) + this._keyStr.charAt(enc4);

						}

						return output;
			 },

			 // public method for decoding
decode : function (input) {
					  var output = "";
					  var chr1, chr2, chr3;
					  var enc1, enc2, enc3, enc4;
					  var i = 0;

					  input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");

					  while (i < input.length) {

								 enc1 = this._keyStr.indexOf(input.charAt(i++));
								 enc2 = this._keyStr.indexOf(input.charAt(i++));
								 enc3 = this._keyStr.indexOf(input.charAt(i++));
								 enc4 = this._keyStr.indexOf(input.charAt(i++));

								 chr1 = (enc1 << 2) | (enc2 >> 4);
								 chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
								 chr3 = ((enc3 & 3) << 6) | enc4;

								 output = output + String.fromCharCode(chr1);

								 if (enc3 != 64) {
											output = output + String.fromCharCode(chr2);
								 }
								 if (enc4 != 64) {
											output = output + String.fromCharCode(chr3);
								 }

					  }

					  output = Base64._utf8_decode(output);

					  return output;

			},

			// private method for UTF-8 encoding
_utf8_encode : function (string) {
							  string = string.replace(/\r\n/g,"\n");
							  var utftext = "";

							  for (var n = 0; n < string.length; n++) {

										 var c = string.charCodeAt(n);

										 if (c < 128) {
													utftext += String.fromCharCode(c);
										 }
										 else if((c > 127) && (c < 2048)) {
													utftext += String.fromCharCode((c >> 6) | 192);
													utftext += String.fromCharCode((c & 63) | 128);
										 }
										 else {
													utftext += String.fromCharCode((c >> 12) | 224);
													utftext += String.fromCharCode(((c >> 6) & 63) | 128);
													utftext += String.fromCharCode((c & 63) | 128);
										 }

							  }

							  return utftext;
					},

					// private method for UTF-8 decoding
_utf8_decode : function (utftext) {
							  var string = "";
							  var i = 0;
							  var c = c1 = c2 = 0;

							  while ( i < utftext.length ) {

										 c = utftext.charCodeAt(i);

										 if (c < 128) {
													string += String.fromCharCode(c);
													i++;
										 }
										 else if((c > 191) && (c < 224)) {
													c2 = utftext.charCodeAt(i+1);
													string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
													i += 2;
										 }
										 else {
													c2 = utftext.charCodeAt(i+1);
													c3 = utftext.charCodeAt(i+2);
													string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
													i += 3;
										 }

							  }

							  return string;
					}

}
